SQL*Module: selecting an Oracle LONG datatype into Ada

We're trying to select an Oracle LONG datatype into an Ada variable using
SQL*Module. When we do a select that should return either 0 or 1 row, we
get an SQL error of -932 (which sounds like incompatible datatypes from
the error text).

Here's the DECLARE CURSOR:
DECLARE cursor_t_policy CURSOR FOR

    SELECT b.policy_text
        FROM  sac.t_plcy_idx a,
              sac.t_plcytext b
        WHERE to_char(a.effective_date) = to_char(sysdate)
        AND b.policy_key = a.policy_key

 ...and here's the FETCH:
PROCEDURE Fetch_t_policy_data (

        :policy_text     CHARACTER(8192),
        SQLCODE);

    FETCH cursor_t_policy
        INTO :policy_text;

(8192 bytes is more than big enough for our purposes, but remember that
the LONG in Oracle is <= 2 Gb).

The open cursor works, but the fetch returns -932.

The variable we're putting it into is declared in Ada as:

    Policy_Text : Sql_Standard.Char (1 .. 8192);     (we tried it declared as Ada's CHAR with the same results).

    Sqlcode : Sql_Standard.Sqlcode_Type := 0;

And the call to fetch looks like:
 Gtp.Fetch_T_Policy_Data (Policy_Text, Sqlcode);

Any ideas?
Thanks.
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